code: def testImpulse(self):
      size = 1024
      specSize = size / 2 + 1
      signal = zeros(size)
      signal[0] = 1
      self.assertEquals(sum(PowerSpectrum()(signal)), specSize)
  
file_path: essentia/test/src/unittests/standard/test_powerspectrum.py
imports: from essentia_test import *
label_desc: Use image node_id 6 for calling the TestPowerSpectrum obj's underlying member method code with example usage: obj.testImpulse() without return types